Preheat oven to 400 degrees Fahrenheit. Roll out the puff pastry dough to a thickness of 1 ½ inches, incorporating sunflower kernels. Roll the dough out to 7 inches long. Brush top of the dough with egg yolk and sprinkle with sunflower kernels.

Turn dough over and brush with egg white and sprinkle with sesame seeds. Cut into 1-inch thick strips and twist the strips. Place on a baking sheet and bake until golden for 15 to 18 minutes.